Add ISMS-PUBLIC Security Policy References to Presentation Materials

[pethers]

Summary:
Update all presentation materials and documentation in the talks repository to reference ISMS-PUBLIC security policies, demonstrating Hack23's security-through-transparency approach.

Background:
The talks repository contains security and development presentations (SecureDevelopmentPipeline, Security.md, LicenseComplianceAlternatives.md) that discuss security practices. These should reference the public ISMS-PUBLIC repository to show concrete policy implementations.

Files Requiring ISMS-PUBLIC References:

1. README.md - Add ISMS-PUBLIC badge/link and "Referenced ISMS Policies" section
2. Security.md - Reference Information_Security_Policy.md and Secure_Development_Policy.md
3. LicenseComplianceAlternatives.md - Link to Open_Source_Policy.md and Third_Party_Management.md
4. SecureDevelopmentPipeline presentations - Add ISMS-PUBLIC references to presenter notes

Tasks:

1. Add ISMS-PUBLIC badge to README.md with prominent link
2. Create "Referenced ISMS Policies" section in README.md
3. Update Security.md to reference specific ISMS-PUBLIC policies using https://github.com/Hack23/ISMS-PUBLIC/blob/main/ format
4. Update LicenseComplianceAlternatives.md to link to Open_Source_Policy.md
5. Add presenter notes to SecureDevelopmentPipeline presentations referencing relevant ISMS-PUBLIC policies
6. Create ISMS_REFERENCE_GUIDE.md mapping presentation topics to ISMS-PUBLIC policies

Integration Points:

• Coordinate with Homepage Discordian Blog ISMS Reference Verification and Correction homepage#424 (blog ISMS references)
• Coordinate with ISMS-PUBLIC Integration for CIA Production Platform (CRITICAL) cia#7778 (CIA platform ISMS-PUBLIC integration)
• Coordinate with Consolidate and Update ISMS-PUBLIC References in Black Trigram blacktrigram#562 (game ISMS-PUBLIC references)

Acceptance Criteria:

• ✅ README.md prominently displays ISMS-PUBLIC links
• ✅ Security.md references specific ISMS-PUBLIC policies (Information_Security_Policy.md, Secure_Development_Policy.md)
• ✅ LicenseComplianceAlternatives.md links to Open_Source_Policy.md from ISMS-PUBLIC
• ✅ All ISMS-PUBLIC links use https://github.com/Hack23/ISMS-PUBLIC/blob/main/ format
• ✅ No broken links
• ✅ ISMS_REFERENCE_GUIDE.md created mapping talks to policies

Expected Outcomes:

• Presentations demonstrate Hack23's transparent security approach
• Attendees can verify security claims via ISMS-PUBLIC
• Consistent ISMS referencing across all Hack23 materials
• Enhanced credibility through documented policies

/cc @pethers